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author | Catalin Marinas <catalin.marinas@arm.com> | 2007-05-08 23:27:46 +0200 |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2007-05-08 23:55:53 +0200 |
commit | bbe888864ec32435e93923c40b9d6ce2bb73844b (patch) | |
tree | db607482fe5898da9a599368d0bbe579a56b272c /arch/arm/mm/cache-v7.S | |
parent | Merge master.kernel.org:/pub/scm/linux/kernel/git/davem/sparc-2.6 (diff) | |
download | linux-bbe888864ec32435e93923c40b9d6ce2bb73844b.tar.xz linux-bbe888864ec32435e93923c40b9d6ce2bb73844b.zip |
[ARM] armv7: add support for ARMv7 cores.
This patch adds support for the ARMv7 cores.
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm/cache-v7.S')
-rw-r--r-- | arch/arm/mm/cache-v7.S | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/arch/arm/mm/cache-v7.S b/arch/arm/mm/cache-v7.S new file mode 100644 index 000000000000..35ffc4d95997 --- /dev/null +++ b/arch/arm/mm/cache-v7.S @@ -0,0 +1,253 @@ +/* + * linux/arch/arm/mm/cache-v7.S + * + * Copyright (C) 2001 Deep Blue Solutions Ltd. + * Copyright (C) 2005 ARM Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This is the "shell" of the ARMv7 processor support. + */ +#include <linux/linkage.h> +#include <linux/init.h> +#include <asm/assembler.h> + +#include "proc-macros.S" + +/* + * v7_flush_dcache_all() + * + * Flush the whole D-cache. + * + * Corrupted registers: r0-r5, r7, r9-r11 + * + * - mm - mm_struct describing address space + */ +ENTRY(v7_flush_dcache_all) + mrc p15, 1, r0, c0, c0, 1 @ read clidr + ands r3, r0, #0x7000000 @ extract loc from clidr + mov r3, r3, lsr #23 @ left align loc bit field + beq finished @ if loc is 0, then no need to clean + mov r10, #0 @ start clean at cache level 0 +loop1: + add r2, r10, r10, lsr #1 @ work out 3x current cache level + mov r1, r0, lsr r2 @ extract cache type bits from clidr + and r1, r1, #7 @ mask of the bits for current cache only + cmp r1, #2 @ see what cache we have at this level + blt skip @ skip if no cache, or just i-cache + mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr + isb @ isb to sych the new cssr&csidr + mrc p15, 1, r1, c0, c0, 0 @ read the new csidr + and r2, r1, #7 @ extract the length of the cache lines + add r2, r2, #4 @ add 4 (line length offset) + ldr r4, =0x3ff + ands r4, r4, r1, lsr #3 @ find maximum number on the way size + clz r5, r4 @ find bit position of way size increment + ldr r7, =0x7fff + ands r7, r7, r1, lsr #13 @ extract max number of the index size +loop2: + mov r9, r4 @ create working copy of max way size +loop3: + orr r11, r10, r9, lsl r5 @ factor way and cache number into r11 + orr r11, r11, r7, lsl r2 @ factor index number into r11 + mcr p15, 0, r11, c7, c14, 2 @ clean & invalidate by set/way + subs r9, r9, #1 @ decrement the way + bge loop3 + subs r7, r7, #1 @ decrement the index + bge loop2 +skip: + add r10, r10, #2 @ increment cache number + cmp r3, r10 + bgt loop1 +finished: + mov r10, #0 @ swith back to cache level 0 + mcr p15, 2, r10, c0, c0, 0 @ select current cache level in cssr + isb + mov pc, lr + +/* + * v7_flush_cache_all() + * + * Flush the entire cache system. + * The data cache flush is now achieved using atomic clean / invalidates + * working outwards from L1 cache. This is done using Set/Way based cache + * maintainance instructions. + * The instruction cache can still be invalidated back to the point of + * unification in a single instruction. + * + */ +ENTRY(v7_flush_kern_cache_all) + stmfd sp!, {r4-r5, r7, r9-r11, lr} + bl v7_flush_dcache_all + mov r0, #0 + mcr p15, 0, r0, c7, c5, 0 @ I+BTB cache invalidate + ldmfd sp!, {r4-r5, r7, r9-r11, lr} + mov pc, lr + +/* + * v7_flush_cache_all() + * + * Flush all TLB entries in a particular address space + * + * - mm - mm_struct describing address space + */ +ENTRY(v7_flush_user_cache_all) + /*FALLTHROUGH*/ + +/* + * v7_flush_cache_range(start, end, flags) + * + * Flush a range of TLB entries in the specified address space. + * + * - start - start address (may not be aligned) + * - end - end address (exclusive, may not be aligned) + * - flags - vm_area_struct flags describing address space + * + * It is assumed that: + * - we have a VIPT cache. + */ +ENTRY(v7_flush_user_cache_range) + mov pc, lr + +/* + * v7_coherent_kern_range(start,end) + * + * Ensure that the I and D caches are coherent within specified + * region. This is typically used when code has been written to + * a memory region, and will be executed. + * + * - start - virtual start address of region + * - end - virtual end address of region + * + * It is assumed that: + * - the Icache does not read data from the write buffer + */ +ENTRY(v7_coherent_kern_range) + /* FALLTHROUGH */ + +/* + * v7_coherent_user_range(start,end) + * + * Ensure that the I and D caches are coherent within specified + * region. This is typically used when code has been written to + * a memory region, and will be executed. + * + * - start - virtual start address of region + * - end - virtual end address of region + * + * It is assumed that: + * - the Icache does not read data from the write buffer + */ +ENTRY(v7_coherent_user_range) + dcache_line_size r2, r3 + sub r3, r2, #1 + bic r0, r0, r3 +1: mcr p15, 0, r0, c7, c11, 1 @ clean D line to the point of unification + dsb + mcr p15, 0, r0, c7, c5, 1 @ invalidate I line + add r0, r0, r2 + cmp r0, r1 + blo 1b + mov r0, #0 + mcr p15, 0, r0, c7, c5, 6 @ invalidate BTB + dsb + isb + mov pc, lr + +/* + * v7_flush_kern_dcache_page(kaddr) + * + * Ensure that the data held in the page kaddr is written back + * to the page in question. + * + * - kaddr - kernel address (guaranteed to be page aligned) + */ +ENTRY(v7_flush_kern_dcache_page) + dcache_line_size r2, r3 + add r1, r0, #PAGE_SZ +1: + mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D line / unified line + add r0, r0, r2 + cmp r0, r1 + blo 1b + dsb + mov pc, lr + +/* + * v7_dma_inv_range(start,end) + * + * Invalidate the data cache within the specified region; we will + * be performing a DMA operation in this region and we want to + * purge old data in the cache. + * + * - start - virtual start address of region + * - end - virtual end address of region + */ +ENTRY(v7_dma_inv_range) + dcache_line_size r2, r3 + sub r3, r2, #1 + tst r0, r3 + bic r0, r0, r3 + mcrne p15, 0, r0, c7, c14, 1 @ clean & invalidate D / U line + + tst r1, r3 + bic r1, r1, r3 + mcrne p15, 0, r1, c7, c14, 1 @ clean & invalidate D / U line +1: + mcr p15, 0, r0, c7, c6, 1 @ invalidate D / U line + add r0, r0, r2 + cmp r0, r1 + blo 1b + dsb + mov pc, lr + +/* + * v7_dma_clean_range(start,end) + * - start - virtual start address of region + * - end - virtual end address of region + */ +ENTRY(v7_dma_clean_range) + dcache_line_size r2, r3 + sub r3, r2, #1 + bic r0, r0, r3 +1: + mcr p15, 0, r0, c7, c10, 1 @ clean D / U line + add r0, r0, r2 + cmp r0, r1 + blo 1b + dsb + mov pc, lr + +/* + * v7_dma_flush_range(start,end) + * - start - virtual start address of region + * - end - virtual end address of region + */ +ENTRY(v7_dma_flush_range) + dcache_line_size r2, r3 + sub r3, r2, #1 + bic r0, r0, r3 +1: + mcr p15, 0, r0, c7, c14, 1 @ clean & invalidate D / U line + add r0, r0, r2 + cmp r0, r1 + blo 1b + dsb + mov pc, lr + + __INITDATA + + .type v7_cache_fns, #object +ENTRY(v7_cache_fns) + .long v7_flush_kern_cache_all + .long v7_flush_user_cache_all + .long v7_flush_user_cache_range + .long v7_coherent_kern_range + .long v7_coherent_user_range + .long v7_flush_kern_dcache_page + .long v7_dma_inv_range + .long v7_dma_clean_range + .long v7_dma_flush_range + .size v7_cache_fns, . - v7_cache_fns |